Protesters and members of the media react to a "blast ball" thrown by police officers during a May Day march in downtown Seattle on Wednesday, May 1, 2013. Police aggressively responded to marchers as they blocked traffic and some threw objects at officers and broke windows. Police responded with pepper spray and blast balls, firework-like devices that emit a puff of pepper.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Protesters and members of the media react to a "blast ball" thrown...

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A man is taken down by officers after scuffling with them after an officer knocked down a woman he was with during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man is taken down by officers after scuffling with them after an...

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Protesters react to a "blast ball" thrown by police officers in downtown Seattle.

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters react to a "blast ball" thrown by police officers in...

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Protesters unsuccessfully attempt to pull down a fence on the way to Capitol Hill during the May Day march.

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters unsuccessfully attempt to pull down a fence on the way...

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A man is arrested during a May Day march in downtown Seattle near Westlake Park.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man is arrested during a May Day march in downtown Seattle near...

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Officers form a line near Westlake Mall during a May Day march in downtown. Police aggressively responded to marchers as they blocked traffic and some threw objects at officers and broke windows. Police responded with pepper spray and blast balls, firework-like devices that emit a puff of pepper.

A woman, in yellow, falls after being shoved by an officer during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A woman, in yellow, falls after being shoved by an officer during a...

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A man is taken down by officers after he scuffled with them when they shoved a woman he was with during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man is taken down by officers after he scuffled with them when...

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A man is taken down by officers after he scuffled with them when they
shoved a woman he was with during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man is taken down by officers after he scuffled with them when...

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A man is taken down by officers after he scuffled with them when they
shoved a woman he was with during a May Day march in downtown Seattle. The man appeared to strike his head on the ground and was heard yelling for an ambulance.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man is taken down by officers after he scuffled with them when...

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A man is taken down by officers after scuffling with them after officers knocked down a woman he was with during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man is taken down by officers after scuffling with them after...

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Police watch over a local business that suffered window damage.

Photo: JORDAN STEAD, SEATTLEPI.COM

Police watch over a local business that suffered window damage.

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Police and protesters clash during May Day on Wednesday, May 1, 2013, in Seattle.

Police face off against demonstrators during a May Day protest in Seattle.

Photo: JORDAN STEAD, SEATTLEPI.COM

Police face off against demonstrators during a May Day protest in...

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Protesters suffer from the effects of pepper spray and "blast balls."

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters suffer from the effects of pepper spray and "blast balls."

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A man reacts to pepper spray during a May Day march.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man reacts to pepper spray during a May Day march.

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Protesters suffer from the effects of pepper spray and "blast balls."

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters suffer from the effects of pepper spray and "blast balls."

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People run from advancing officers and fireworks lit by a protester during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

People run from advancing officers and fireworks lit by a protester...

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Protesters stopped traffic for a dance party during the May Day march.

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters stopped traffic for a dance party during the May Day march.

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Police officers advance through a cloud of smoke during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Police officers advance through a cloud of smoke during a May Day...

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A protester gestures to officers during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A protester gestures to officers during a May Day march in downtown...

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A smashed window is shown at a Walgreen's store in Capitol Hill on Broadway and East Pine Street.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A smashed window is shown at a Walgreen's store in Capitol Hill on...

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A man cleans up trash thrown by protesters as they overturned trash cans on Broadway in Capitol Hill.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man cleans up trash thrown by protesters as they overturned trash...

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A "blast ball," bottom right, rolls through protesters before it exploded during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A "blast ball," bottom right, rolls through protesters before it...

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Participants dance with a flag during a May Day march in downtown Seattle. Police aggressively responded to marchers as they blocked traffic and some threw objects at officers and broke windows.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Participants dance with a flag during a May Day march in downtown...

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KIRO/7 reporter David Ham is covered with silly string during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

KIRO/7 reporter David Ham is covered with silly string during a May...

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Protesters stop traffic with a swarm of bodies during the May Day march.

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters stop traffic with a swarm of bodies during the May Day...

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A man is taken down by officers after scuffling with them after an officer knocked down a woman he was with.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man is taken down by officers after scuffling with them after an...

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Officers order a man to move during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Officers order a man to move during a May Day march in downtown...

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KOMO/4 reporter Jon Humbert, reacts with A.J. Roberts, left, after Humbert was hit with pepper spray during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

KOMO/4 reporter Jon Humbert, reacts with A.J. Roberts, left, after...

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People run from "blast balls" and pepper spray during a May Day march in downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

People run from "blast balls" and pepper spray during a May Day...

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Protesters attempt to set up a barricade near Seattle Central Community College.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Protesters attempt to set up a barricade near Seattle Central...

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A "blast ball" explodes.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A "blast ball" explodes.

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Officers advance toward Capitol Hill from downtown on Pine Street.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Officers advance toward Capitol Hill from downtown on Pine Street.

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A man holds up a sign in front of officers on Pine Street.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man holds up a sign in front of officers on Pine Street.

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Protesters suffer from the effects of pepper spray.

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters suffer from the effects of pepper spray.

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A line of police push protesters up into Capitol Hill.

Photo: JORDAN STEAD, SEATTLEPI.COM

A line of police push protesters up into Capitol Hill.

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Protesters gather in an intersection.

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters gather in an intersection.

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Police form a line in downtown Seattle.

Photo: JORDAN STEAD, SEATTLEPI.COM

Police form a line in downtown Seattle.

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A man holds up a sign in front of officers on Pine Street.

Photo: JORDAN STEAD, SEATTLEPI.COM

A man holds up a sign in front of officers on Pine Street.

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Protesters attempt to set up a barricade on Pine Street.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Protesters attempt to set up a barricade on Pine Street.

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Protesters stopped traffic for a dance party.

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters stopped traffic for a dance party.

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Protesters gather near Westlake Park.

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters gather near Westlake Park.

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Police arrest protesters near the Paramount Theatre.

Photo: JORDAN STEAD, SEATTLEPI.COM

Police arrest protesters near the Paramount Theatre.

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Police and protesters clash in downtown Seattle.

Photo: JORDAN STEAD, SEATTLEPI.COM

Police and protesters clash in downtown Seattle.

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Protesters react to a "blast ball" thrown by police officers in downtown Seattle.

Photo: JORDAN STEAD, SEATTLEPI.COM

Protesters react to a "blast ball" thrown by police officers in...

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A lone anarchist, center, yells over an SPD press conference at Westlake Park.

Photo: JORDAN STEAD, SEATTLEPI.COM

A lone anarchist, center, yells over an SPD press conference at...

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A protester tags a walls and sidewalk while retreating from a line of advancing police.

Photo: JORDAN STEAD, SEATTLEPI.COM

A protester tags a walls and sidewalk while retreating from a line...

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People march down Jackson Street during an immigrant rights May Day rally in Seattle on Wednesday, May 1, 2013. Thousands of people marched, demanding immigration reform. The march was peaceful and was unrelated to a later march that ended with police using bang balls and pepper spray to disperse the crowd. The later march resulted in 17 arrests and injuries to officers.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

People march down Jackson Street during an immigrant rights May Day...

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A man who said his name is John Smith holds a Dominican Republic flag during an immigrant rights May Day rally at Judkins Park.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man who said his name is John Smith holds a Dominican Republic...

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People march under Interstate 5 during an immigrant rights May Day rally.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

People march under Interstate 5 during an immigrant rights May Day...

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An Aztec dancer burns incense during an immigrant rights May Day march through downtown Seattle.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

An Aztec dancer burns incense during an immigrant rights May Day...

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People unfurl a banner during an immigrant rights May Day march.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

People unfurl a banner during an immigrant rights May Day march.

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Emily Rodriguez, 15, left, from Mexico, holds a sign during an immigrant rights May Day rally and march.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Emily Rodriguez, 15, left, from Mexico, holds a sign during an...

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People gather outside Casa Latina during an immigrant rights May Day rally and march.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

People gather outside Casa Latina during an immigrant rights May...

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Anarchists walk alongside other marchers during an immigrant rights May Day march.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Anarchists walk alongside other marchers during an immigrant rights...

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A man applauds marchers during an immigrant rights May Day rally and march.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A man applauds marchers during an immigrant rights May Day rally...

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Seattle police officers stand outside of a bank during an immigrant rights May Day rally and march.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Seattle police officers stand outside of a bank during an immigrant...

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Marchers make their way through the International District.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Marchers make their way through the International District.

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Marchers, including Lorena Sanchez and her daughter Zoe make their way through the International District.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Marchers, including Lorena Sanchez and her daughter Zoe make their...

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Marchers make their way under Interstate 5.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Marchers make their way under Interstate 5.

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Marchers kickoff an immigrant rights May Day rally and march near Judkins Park.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

Marchers kickoff an immigrant rights May Day rally and march near...

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A young participant throws up her arms during an immigrant rights May Day rally in Seattle on Wednesday, May 1, 2013. Thousands of people marched, demanding immigration reform. A handful of black-clad protesters participated but the march was peaceful.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

A young participant throws up her arms during an immigrant rights...

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Marchers took to megaphones, chanting "Si se puede" during peaceful May Day procession.

Photo: JORDAN STEAD, SEATTLEPI.COM

Marchers took to megaphones, chanting "Si se puede" during peaceful...

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A pair of hands pull down a Mexican flag to conceal the occupants of a mock jail on a float.

Photo: JORDAN STEAD, SEATTLEPI.COM

A pair of hands pull down a Mexican flag to conceal the occupants...

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People march down Jackson Street during an immigrant rights May Day rally.

Photo: JOSHUA TRUJILLO, SEATTLEPI.COM

People march down Jackson Street during an immigrant rights May Day...